BC55PAS-QX Equivalent & Substitute Parts

Part Overview

The BC55PAS-QX is an NPN bipolar junction transistor (BJT) manufactured by Nexperia USA Inc. in a 3-UDFN Exposed Pad surface mount package. This automotive-grade component operates at maximum ratings of 60 V collector-emitter breakdown voltage, 1 A collector current, and 420 mW power dissipation with a transition frequency of 180 MHz. The part is Active in product status and carries AEC-Q101 automotive qualification. Substitute parts are identified based on identical electrical specifications, package compatibility, and compliance certifications to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	1	A
Power - Max	420	mW
Frequency - Transition	180	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	63 @ 150mA, 2V	—
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (TJ)	150	°C
Package / Case	3-UDFN Exposed Pad	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BC55PAS-QX are identified as parametric equivalents based on the following criteria:

Electrical Parameters (Identical):

Collector-emitter breakdown voltage: 60 V
Maximum collector current: 1 A
Maximum power dissipation: 420 mW
Transition frequency: 180 MHz
DC current gain (hFE): 63 @ 150mA, 2V
Vce saturation: 500mV @ 50mA, 500mA
Collector cutoff current: 100 nA
Operating temperature: 150°C

Mechanical Parameters (Identical):

Package type: 3-UDFN Exposed Pad (DFN2020D-3)
Mounting type: Surface Mount
Supplier device package: DFN2020D-3

Compliance Parameters:

Automotive grade classification
RoHS3 compliance
REACH unaffected status
ECCN: EAR99

All substitute parts maintain identical electrical and mechanical specifications, ensuring direct functional interchangeability in circuit designs. Differences in qualification level (AEC-Q101 vs. AEC-Q100) and moisture sensitivity level (MSL) designations do not affect parametric equivalence.

Parameter Comparison

Parameter	BC55PAS-QX	BC55-10PAS-QX	BC55-16PASX	BC55PA,115	BC55PASX
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V	60 V	60 V
Current - Collector (Ic) (Max)	1 A	1 A	1 A	1 A	1 A
Power - Max	420 mW	420 mW	420 mW	420 mW	420 mW
Frequency - Transition	180 MHz	180 MHz	180 MHz	180 MHz	180 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	63 @ 150mA, 2V	63 @ 150mA, 2V	63 @ 150mA, 2V	63 @ 150mA, 2V	63 @ 150mA, 2V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA
Operating Temperature (TJ)	150°C	150°C	150°C	150°C	150°C
Package / Case	3-UDFN Exposed Pad	3-UDFN Exposed Pad	3-UDFN Exposed Pad	3-UDFN Exposed Pad	3-UDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Automotive	Automotive	Automotive	Automotive
Product Status	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All identified substitute parts—BC55-10PAS-QX, BC55-16PASX, BC55PA,115, and BC55PASX—are Active products manufactured by Nexperia USA Inc. with identical electrical and mechanical specifications to the BC55PAS-QX. Each part is automotive-grade and RoHS3 compliant, meeting REACH unaffected status requirements.

Qualification Considerations: The BC55PAS-QX carries AEC-Q101 qualification. Substitute parts BC55-16PASX, BC55PA,115, and BC55PASX carry AEC-Q100 qualification, while BC55-10PAS-QX carries AEC-Q101 qualification. Both AEC-Q100 and AEC-Q101 are valid automotive qualifications; selection depends on specific application requirements and design documentation.

Moisture Sensitivity Level (MSL): BC55-10PAS-QX, BC55-16PASX, BC55PA,115, and BC55PASX are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.

Inventory Availability: BC55PASX offers the highest inventory level at 26,990 pieces. BC55-16PASX provides 6,532 pieces. BC55PA,115 and BC55-10PAS-QX each provide approximately 3,900+ pieces. The main part BC55PAS-QX has 874 pieces in stock.

All substitute parts are suitable for direct replacement in applications where the BC55PAS-QX is specified, provided that qualification level requirements are satisfied by the design documentation.

Frequently Asked Questions (FAQ)

Q: Can BC55-10PAS-QX, BC55-16PASX, BC55PA,115, and BC55PASX be used interchangeably with BC55PAS-QX?

A: Yes. All substitute parts share identical electrical parameters (60 V breakdown voltage, 1 A collector current, 420 mW power, 180 MHz transition frequency, 63 hFE minimum, and 500 mV saturation voltage), identical mechanical package specifications (3-UDFN Exposed Pad, DFN2020D-3), and identical compliance certifications (automotive grade, RoHS3, REACH unaffected). Direct functional replacement is supported.

Q: What is the difference between AEC-Q101 and AEC-Q100 qualifications?

A: Both are valid automotive qualifications. AEC-Q101 applies to discrete semiconductors, while AEC-Q100 applies to integrated circuits. The BC55PAS-QX carries AEC-Q101. Substitute parts BC55-16PASX, BC55PA,115, and BC55PASX carry AEC-Q100. Application requirements and design documentation determine which qualification level is necessary for your specific use case.

Q: Are all substitute parts available in the same package?

A: Yes. All parts—BC55PAS-QX, BC55-10PAS-QX, BC55-16PASX, BC55PA,115, and BC55PASX—are packaged in 3-UDFN Exposed Pad (DFN2020D-3) surface mount configuration. PCB layout and assembly processes remain unchanged.

Q: What is MSL 1 (Unlimited) moisture sensitivity level?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. Parts may be stored and handled without special moisture control measures, simplifying inventory management and supply chain logistics.

Q: Which substitute part has the best inventory availability?

A: BC55PASX offers the highest inventory level at 26,990 pieces in stock, followed by BC55-16PASX at 6,532 pieces. Both provide substantial availability for production requirements.

Q: Do all parts meet RoHS3 compliance?

A: Yes. All parts—BC55PAS-QX, BC55-10PAS-QX, BC55-16PASX, BC55PA,115, and BC55PASX—are RoHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for automotive and industrial applications.

Q: Can I mix different substitute part numbers in the same production run?

A: Yes. Since all parts are parametric equivalents with identical electrical and mechanical specifications, they may be used interchangeably within the same design. However, design documentation and qualification records should reflect the specific part number used in each unit for traceability purposes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message